Contradiction with Philippians 2:12
This verse emphasizes working out one's own salvation with fear and trembling, which can be seen as contradicting Colossians 1:12 that speaks of giving thanks for an inheritance given freely by God.
Philippians 2:12: Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling.
Contradiction with James 2:24
This verse states that a person is justified by works and not by faith only, which contrasts with the notion in Colossians 1:12 of giving thanks for a grace-filled inheritance.
James 2:24: Ye see then how that by works a man is justified, and not by faith only.